JP2004217337A - Post-processing device, image forming system, and paper punching method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a post-processing device having a simple structure capable of matching paper sheets to prevent their deviation from the right position in the conveying direction or the width direction and eliminating irregularity of punch hole positions. <P>SOLUTION: The post-processing device holds and conveys a paper sheet by a conveyance roller with its abutting member retreated from a conveying passage of paper sheets. At least after the front edge part of the paper sheet passes a punching means, an actuator is energized and the sheet is released from the conveyance roller. The post-processing device matches the width of the paper sheet by a matching means, stops energizing the actuator, and holds the paper sheet again by the conveyance roller. Then, after the rear edge part of the sheet is made to come into contact with the abutting member inserted in the paper sheet conveying passage, the punching means carries out the punching process for the sheet. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a post-processing device that punches a hole for a file at a predetermined position of a conveyed paper by punching, an image forming system to which the post-processing device is connected, and a paper punching method.
[0002]
[Prior art]
In recent years, after a paper punching process has been automatically performed in order to file a sheet on which an image is formed by an image forming apparatus such as an electrophotographic copying machine, a printer, a facsimile, and a multifunction peripheral having these functions. A processing device is provided. As a result, it is possible to save the labor of the operator by bundling the output sheets and setting them on the office punch, positioning them, and making holes, thereby making the office work very efficient.
[0003]
In such a post-processing apparatus, if each sheet is punched in a state where it is misaligned or tilted, the punch hole position is also deviated, and the sheet becomes uneven and unsightly when filing. is there.
[0004]
For this reason, conventionally, the sheet has been misaligned or tilted by performing a resist process for applying the sheet to a member orthogonal to the conveyance direction or increasing the component accuracy of the conveyance member.
[0005]
As an example of dealing with such a problem, when the trailing edge of the sheet (paper) passes through the first conveyance roller, a relative difference is given to the conveyance speed between the first conveyance roller and the second conveyance roller, Patent Document 1 discloses a sheet storage device that determines a punch hole position by curving a sheet between both rollers and bringing a rear end portion of a sheet into contact with a first conveyance roller (see Patent Document 1).
[0006]
[Patent Document 1]
Japanese Patent No. 3301195 (2nd page)
[0007]
[Problems to be solved by the invention]
However, in Patent Document 1, although the punch hole is positioned in the paper transport direction, there is nothing to regulate in the paper width direction, so the punch hole is shifted or inclined in the paper width direction. Happen.
[0008]
The present invention has been made in view of such a problem. With a simple configuration, the sheet is aligned so as not to be displaced in the transport direction and the width direction, and variations in punch hole positions are eliminated. It is an object of the present invention to propose a post-processing apparatus that prevents the image from becoming unsightly, an image forming system to which the post-processing apparatus is connected, and a sheet punching method.
[0009]
[Means for Solving the Problems]
The above object can be achieved by any of the following means.
[0010]
(1) In a post-processing apparatus provided with a punching means for punching a file hole at a predetermined position of the conveyed paper by punching, it is composed of a drive roller and a driven roller, and is downstream of the punching means in the paper transport direction. A conveying roller that is disposed on the side and conveys the sheet while sandwiching the sheet, a biasing member that biases the driven roller in a direction in which the paper is pressed against the driving roller, and a pressure-bonding of the driven roller to the driving roller by energization Are disposed on the upstream side of the punch with respect to the punch, an actuator that releases the urging member against an urging force of the urging member, an alignment unit that aligns the width of the sheet in a sheet width direction orthogonal to the sheet conveyance direction. An abutting member that is inserted into and removed from the paper conveyance path, and the sheet is moved in a state in which the abutting member is retracted from the paper conveyance path. The sheet is nipped and conveyed by the feed roller, and at least the leading end of the sheet passes through the punching means, and then the actuator is energized to release the nipping of the sheet by the conveying roller, and the sheet is fed by the aligning means. Then, the actuator is de-energized, the paper is held again by the transport roller, and the rear end of the paper is brought into contact with the abutting member inserted in the paper transport path. And then punching the sheet by the punching means.
[0011]
(2) An image forming system in which the post-processing apparatus according to any one of claims 1 to 5 is connected to an image forming apparatus having at least an image writing unit, an image forming unit, a sheet conveying unit, and a control unit.
[0012]
(3) In a paper punching method in which a hole for a file is punched at a predetermined position of the transported paper by a punch provided in the punching means, the transport roller disposed on the downstream side in the paper transport direction with respect to the punching means Nipping and conveying the sheet, passing at least the leading end of the sheet through the punching unit, releasing the nipping of the sheet by the conveying roller by energizing an actuator, and aligning unit A step of aligning the width in a paper width direction orthogonal to the paper transport direction, a step of stopping energization of the actuator and sandwiching the paper again by the transport roller, and disposed upstream of the punch in the paper transport direction Inserting the abutted abutting member into the sheet conveyance path, abutting the rear end of the sheet and the abutting member, and the punching Paper perforated method characterized by comprising a, a step of punching the sheet by stage.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the drawings.
[0014]
First, the configuration of the image forming system will be described based on the configuration diagram of FIG. This is merely an example, and any form of image forming apparatus or post-processing apparatus is included in the scope of the present invention as long as the punching process described later is performed. It is.
[0015]
The image forming apparatus A includes a charging unit 2, an image exposing unit 3, a developing unit 4, a transfer unit 5 A, a charge removing unit 5 B, a separation claw 5 C, and a cleaning unit 6 around the rotating image carrier 1. After the surface of the image carrier 1 is uniformly charged by the means 2, exposure scanning based on the image data read from the document is performed by the laser beam of the image exposure means 3 to form a latent image. The toner image is formed on the surface of the image carrier 1 by reversal development by the developing means 4.
[0016]
In the claims, the image writing means corresponds to the image exposure means 3, and the image forming means corresponds to the charging means 2, the developing means 4, and the transfer means 5A.
[0017]
On the other hand, an image recording sheet (hereinafter referred to as a sheet) S fed from the sheet feeding means 7A is sent to the transfer position. The toner image is transferred onto the paper S by the transfer means 5A at the transfer position. Thereafter, the charge on the back surface of the sheet S is erased by the charge eliminating unit 5B, separated from the image carrier 1 by the separation claw 5C, conveyed by the intermediate conveying unit 7B, and subsequently heated and fixed by the fixing unit 8, and the sheet discharge roller 7C. It is discharged by.
[0018]
When image formation is performed on one side of the paper S, the transport path switching plate 7D is switched to a broken line state.
[0019]
Further, the developer remaining on the surface of the image carrier 1 after the image processing is removed by the cleaning unit 6 downstream of the separation claw 5C to prepare for the next image formation.
[0020]
On the other hand, when image formation is performed on both sides of the sheet S, the sheet S heated and fixed by the fixing unit 8 is conveyed downward by switching the conveyance path switching plate 7D to the state of the solid line, and in the reverse conveyance unit 7E. After switching back and upside down, a new toner image is transferred to the back side at the transfer position. After that, it is heated and fixed in the same process as described above, passes through the transport path switching plate 7D switched to the broken line state, and is then discharged by the paper discharge roller 7C.
[0021]
Further, as will be described later, when punching processing, folding processing, binding processing, and the like are performed, the sheet S heated and fixed by the fixing unit 8 is transported downward and reversed by switching the transport path switching plate 7D to a solid line state. In the conveying means 7E, it is switched back and turned upside down and discharged by the paper discharge roller 7C.
[0022]
In any state, the paper S discharged from the paper discharge roller 7C is sent to the post-processing device FS.
[0023]
An operation unit 9 for selecting and setting an image forming mode and a paper post-processing mode is disposed on the upper front side of the image forming apparatus A. An original moving type reading method is disposed on the upper part of the image forming apparatus A. An image reading apparatus B provided with an automatic document feeder is installed.
[0024]
In the post-processing device FS, a first paper feed tray 20A, a second paper feed tray 20B, and a fixed paper ejection tray 91 are arranged in the upper stage of the figure, and the punching means 30, the shift means 50, and the paper ejection means 60 are omitted in the middle stage. The binding means 70 and the folding means 80 are arranged in series on the same plane that is inclined, and the binding means 70 and the folding means 80 are arranged in series on the same plane.
[0025]
In addition, on the left side of the post-processing device FS, there is an up-and-down discharge tray 92 that stacks and moves the shift-processed paper S and the binding-processed paper bundle, and a paper bundle that has been folded in three or two. A fixed paper discharge tray 93 on which T is loaded is disposed.
[0026]
Then, the paper S discharged from the paper discharge roller 7C of the image forming apparatus A is introduced into the entrance roller 11 of the post-processing apparatus FS. The entrance roller 11 is arranged so that the position thereof coincides with the paper discharge roller 7C of the image forming apparatus A.
[0027]
The entrance roller 11 includes not only the sheet S discharged from the image forming apparatus A but also a slip sheet (inter sheet) supplied from the first sheet feed table 20A and inserted between the sheet bundles, and the second sheet supply. A cover sheet that is supplied from the paper table 20B and serves as a cover of a sheet bundle is also introduced. The interleaving paper is separated and fed by the paper feed roller 21, transported by the plurality of transport rollers 23 and introduced into the entrance roller 11, and the cover sheet is separated and fed by the paper feed roller 22, and is transported by the plurality of transport rollers 23. It is conveyed and introduced into the entrance roller 11.
[0028]
A punching means 30 is arranged downstream of the entrance roller 11 in the paper transport direction, and two to four holes for files are punched at predetermined positions on the transported paper S, interleaf paper, and cover paper. Is done. Since the punching process by the punching means 30 is the gist of the present invention, it will be described in detail separately. The punched paper S or the like is transported by the transport rollers 12, 13, and 14 and reaches a pair of switching gates G.
[0029]
The switching gate G is driven by a solenoid (not shown) in three paper conveyance paths, that is, a first conveyance path F1 reaching the fixed sheet discharge tray 91, a second conveyance path F2 reaching the shift means 50, and a third conveyance reaching the binding means 70. A branch is selectively made to one of the paths F3.
[0030]
Here, when simple paper discharge is set, the switching gate G opens only the first transport path F1, and blocks the other second transport path F2 and third transport path F3. Then, the sheets S and the like pass through the first conveyance path F <b> 1 and are sequentially stacked on the fixed sheet discharge tray 91.
[0031]
When the shift process is set, the switching gate G opens only the second transport path F2 and blocks the first transport path F1 and the third transport path F3. Then, the sheet S passes through the second conveyance path F2, and is shifted by the shift unit 50 in a direction orthogonal to the sheet conveyance direction. The shift unit 50 performs a shift process for changing the paper discharge position of the paper S in the transport width direction every predetermined number of sheets. The shifted sheets S are discharged to the lifting / discharging tray 92 and sequentially placed.
[0032]
When the binding process or the folding process is set, the switching gate G opens only the third transport path F3 and blocks the first transport path F1 and the second transport path F2. Then, the sheet S passes through the third conveyance path F3, and the leading end portion of the sheet S comes into contact with the vicinity of the holding position of the entrance conveyance roller pair (registration roller) 71 to be stopped, and the alignment of the sheet leading end is performed. After the trailing end of the sheet S in the advancing direction is discharged from the nipping position of the entrance conveyance roller pair 71, the sheet S is discharged upward along the sheet placing table 72 by inertial force, and then turns down due to its own weight. It slides and descends on the inclined surface of the paper mounting table 72 and stops.
[0033]
When a predetermined number of sheets S (sheet bundle) are stacked on the sheet mounting table 72, they are aligned by a pair of width alignment members (not shown) that are movably provided on both sides of the sheet mounting table 72, The binding means 70 strikes a binding needle at one location near the side edge of the sheet bundle or at two locations in the center, and the binding process is performed. The bound sheet bundle is slid on the placement surface of the sheet placement table 72 and pushed upward obliquely, and is discharged and stacked on the lift sheet discharge table 92.
[0034]
The second folding processing means 80 can perform two-fold processing and three-fold processing, but the description thereof is omitted.
[0035]
Next, a punching mechanism according to the present invention will be described with reference to FIGS.
[0036]
First, the configuration of the punching processing mechanism will be described with reference to FIGS. FIG. 2 is a side view of the main part of the punching mechanism, and FIG. 3 is a top view of the main part of the punching mechanism.
[0037]
In both figures, the entrance roller 11, the transport rollers 12, 13 and the punching means 30 are the same as those shown in FIG. The entrance roller 11 and the transport rollers 12 and 13 are respectively composed of drive rollers 11a, 12a and 13a and driven rollers 11b, 12b and 13b. The drive rollers 11a, 12a and 13a are driven by a motor (not shown). Further, an upper guide plate 31 and a lower guide plate 32 are arranged so that the paper S is reliably guided and transported by the transport rollers 12 and 13. The torsion coil spring 33 is engaged with the spring hooking portion 31a provided on the upper guide plate 31, and one end of the torsion coil spring 33 presses the support shafts 12c and 13c of the driven rollers 12b and 13b. , 13b are pressure-bonded to the drive rollers 12a, 13a. Further, since the driven rollers 12b and 13b are configured to be movable upward after the pressure bonding to the drive rollers 12a and 13a is released, the upper guide plate 31 is provided with a guide portion 31b for guiding the support shafts 12c and 13c. ing.
[0038]
The urging member in the claims corresponds to the torsion coil spring 33, but the urging member is not necessarily limited to the torsion coil spring, and a helical spring for tension or compression, a plate A spring or the like may be used. In short, any biasing member may be used as long as the driven rollers 12b and 13b can be biased in the direction in which the driven rollers 12b and 13b are pressed against the driving rollers 12a and 13a.
[0039]
Two solenoids 34 are disposed above the upper guide plate 31, and crank levers 35 are provided between the solenoids 34 and the driven rollers 12b and 13b, respectively. One end of the crank lever 35 is engaged with the plunger 34a of each solenoid 34, and the other end of the crank lever 35 is configured to be able to press the lower portions of the support shafts 12c and 13c of the driven rollers 12b and 13b upward. .
[0040]
In addition, both side ends of the sheet S conveyed to the positions of the conveying rollers 12 and 13 are pressed from the sheet width direction perpendicular to the sheet conveying direction toward the center to adjust the width, thereby causing variations in the width direction of the sheet S. The width alignment plates 41 and 42 to be eliminated are provided. The width alignment plates 41 and 42 can be moved in the paper width direction and in opposite directions to each other by a belt 43 driven by a stepping motor (not shown), and are supported by support shafts 44 and 45.
[0041]
The punching means 30 is provided with a punch 30a for punching a file hole in the paper S. A plurality of abutting members 48 are provided on the upstream side of the punch 30a in the paper transport direction. The abutting member 48 is rotatable about a support shaft 49 by a stepping motor (not shown), and when the sheet S is passed through the punching means 30 from the upstream side in the sheet conveying direction as will be described later, the abutting member 48. Is retracted from the transport path 30b of the paper S, and when the paper S is transported from the downstream side in the paper transport direction to the punching means 30, the abutting member 48 is inserted into the transport path 30b of the paper S, and the paper S It is the structure which abuts the rear-end part.
[0042]
The actuator that drives the abutting member 48 is not limited to a stepping motor, and the abutting member may be inserted into and removed from the conveyance path 30b by a solenoid.
[0043]
A sensor 47 that detects the paper S is disposed upstream of the punching unit 30 in the paper conveyance direction.
[0044]
Next, the drilling process will be described step by step based on FIGS.
First, in FIGS. 1 and 2, the sheet S discharged from the sheet discharge roller 7 </ b> C of the image forming apparatus A is sent to the inlet roller 11 of the post-processing apparatus FS and is conveyed to the punching unit 30 by the inlet roller 11. At this time, the abutting member 48 is retracted from the conveyance path 30b of the punching means 30, and the sheet S passes through the conveyance path 30b as it is. The leading edge of the sheet S is transported between the upper guide plate 31 and the lower guide plate 32 by the transport roller 12, but when the sensor 47 detects the trailing end of the sheet S, the control means (not shown) The timer is activated, and the rotation of the transport rollers 12 and 13 is stopped after a predetermined time has elapsed. At this time, the sheet S is sandwiched between the conveying rollers 12 and 13, and the width alignment plates 41 and 42 are positioned at positions slightly outside the both end portions of the sheet S and not contacting the both end portions. . This state is shown in FIG.
[0045]
Next, when the rotation of the conveying rollers 12 and 13 is stopped and the state shown in FIG. 2 is reached, the two solenoids 34 are energized by the control means, and the respective plungers 34 a are drawn into the solenoids 34. Then, both crank levers 35 rotate, and one end of the crank lever 35 presses the lower portions of the support shafts 12c, 13c of the driven rollers 12b, 13b upward against the urging force of the torsion coil spring 33, and the driven rollers The pressure bonding to the driving rollers 12a and 13a by 12b and 13b is released. This state is shown in FIG.
[0046]
When the crimping of the driven rollers 12b and 13b to the driving rollers 12a and 13a is released, the nipping of the paper S by each roller is released. Therefore, a stepping motor (not shown) is driven to rotate the belt 43. The width alignment plates 41 and 42 are moved in the center direction, and both side edges of the paper S are pressed to perform the width alignment of the paper S.
[0047]
When the width alignment of the paper S is completed, the solenoid 34 stops energization. Then, the plunger 34a protrudes, and one end of the crank lever 35 retreats downward from the lower part of the support shafts 12c, 13c of the driven rollers 12b, 13b, so that the driven rollers 12b, 13b are driven again by the biasing force of the torsion coil spring 33. 12a and 13a are crimped. That is, the sheet S is sandwiched again by each roller and returns to the state shown in FIG.
[0048]
Subsequently, the motor that drives the drive rollers 12a and 13a is reversely rotated. Then, the paper S is reversely conveyed upstream in the paper conveyance direction by the reverse rotation of the driving rollers 12a and 13a. At this time, the abutting member 48 rotates about 90 degrees counterclockwise and is inserted into the conveyance path 30b of the paper S, so that the rear end portion of the paper S conveyed in the reverse direction abuts against the abutting member 48. Touch. This state is shown in FIG. Then, after the reverse rotation of the motor starts, the timer starts measuring time, and after the time for which the rear end portion of the paper S comes into contact with the abutting member 48 has elapsed, the reverse rotation of the motor is stopped.
[0049]
As shown in FIG. 5, in order to ensure that the trailing edge of the sheet S abuts against the abutting member 48, the upstream end of the upper guide plate 31 and the lower guide plate 32 on the upstream side in the sheet conveying direction is outward. The sheet S has an open shape so that the sheet S can be bent with the punching means 30.
[0050]
In this way, the sheet S is aligned in width, and the rear end portion is in contact with the abutting member 48 and is also aligned in the transport direction. Therefore, the punching means 30 is driven and the punch 30a is used. A predetermined number of punch holes are punched in the paper S.
[0051]
FIG. 6 is a plan view showing various examples of paper that has been punched by the punching means. 6A shows an example in which holes h are perforated at two places near the rear end d of the paper S (two-hole file), and FIG. 6B shows three places near the rear end d of the paper S. FIG. 6C shows an example in which holes h are drilled at four locations in the vicinity of the rear end d of the paper S (four-hole file). The intervals between the plurality of holes h are standardized as shown in the drawing. The perforation end surface distance e from the rear end d of the paper S to the hole h can be arbitrarily set, but is generally 9 to 11 mm.
[0052]
Here, to summarize the control of the control means (not shown) in the above operation, the control means stops the rotation of the transport rollers 12 and 13 by the motor after the sensor 47 detects the rear end portion of the paper S. The solenoid 34 is energized, the belt 43 is rotated by the stepping motor to move the width aligning plates 41 and 42, the energization of the solenoid 34 is stopped, the transport rollers 12 and 13 are reversed, and the abutting member by the stepping motor 48 is rotated, the reverse rotation of the conveying rollers 12 and 13 is stopped, and a series of controls for driving the punching means 30 is performed at predetermined time intervals by operating a timer.
[0053]
The operation of rotating the abutting member 48 by the stepping motor is performed after the trailing end of the sheet S is conveyed downstream in the sheet conveying direction from the position of the conveying path 30b where the abutting member 48 is to be inserted. For example, it may be performed at any time.
[0054]
Further, this control means may be provided in the image forming apparatus A or may be provided in the post-processing apparatus FS.
[0055]
In addition, in the configuration described above, the driving rollers 12a and 13a are reversed to transport the paper S in the reverse direction, and the rear end portion of the paper S is brought into contact with the abutting member 48. Thus, it is not necessary to transport the paper S in the reverse direction. That is, even if the leading edge of the sheet S passes through the conveyance path 30b of the punching means 30, the conveyance of the sheet S is stopped while the trailing edge of the sheet S is still positioned in the conveyance path 30b. Performs the width alignment as described above, and the abutting member 48 is rotated and brought into contact with the rear end portion of the sheet S in a state where the sheet S is held again by the conveying rollers 12 and 13 and stopped. May be.
[0056]
The actuator for rotating the crank lever 35 is not limited to a solenoid, and the crank lever 35 may be rotated by a stepping motor. Of course, the member driven by the stepping motor may be a member other than the crank lever. In short, any member can be used as long as the predetermined actuator releases the pressure-bonding to the driving rollers 12a and 13a by the driven rollers 12b and 13b. Such a configuration may be adopted.
[0057]
According to the post-processing apparatus, the image forming system, and the paper punching method of the present invention, the paper is aligned so as not to be misaligned in the transport direction and the width direction with a simple configuration, and the punch hole position is adjusted. By eliminating this variation, the effect of not being unsightly during filing can be achieved.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an image forming system.
FIG. 2 is a side view of a main part of a punching mechanism, in which a sheet is fed by a conveyance roller.
FIG. 3 is a top view of a main part in the punching processing mechanism.
FIG. 4 is a side view of a main part in the punching processing mechanism, in which the crimping of the driven roller to the driving roller is released.
FIG. 5 is a side view of a main part in the punching mechanism, and is a view when punching a sheet.
FIG. 6 is a plan view showing various examples of paper that has been punched by punching means.
[Explanation of symbols]
A Image forming apparatus FS Post-processing apparatus S Paper 11 Inlet rollers 11a, 12a, 13a Drive rollers 11b, 12b, 13b Driven rollers 12, 13 Conveying roller 30 Punching means 30a Punch 30b Conveying path 31 Upper guide plate 32 Lower guide plate 33 Torsion Coil spring 34 Solenoid 35 Crank lever 41, 42 Width alignment plate 48 Abutting member

Claims (10)

In a post-processing apparatus provided with a punching means for punching a hole for a file by a punch at a predetermined position of the conveyed paper,
A transport roller configured of a driving roller and a driven roller, disposed downstream of the punching unit in a paper transport direction, and sandwiching and transporting the paper;
A biasing member that biases the driven roller in a direction in which the driving roller is pressure-bonded;
An actuator that releases the pressure bonding of the driven roller by the driven roller against the biasing force of the biasing member by energizing;
Alignment means for width-aligning the paper in a paper width direction orthogonal to the paper transport direction;
An abutting member that is disposed on the upstream side in the paper conveyance direction with respect to the punch, and that is inserted into and removed from the conveyance path of the paper,
With the abutting member retracted from the sheet conveyance path, the sheet is nipped and conveyed by the conveyance roller, and at least the leading end of the sheet passes through the punching means, and then the actuator is energized. The paper is nipped by the conveyance roller, the width of the paper is aligned by the aligning means, the energization of the actuator is stopped, and the paper is nipped again by the conveyance roller. A post-processing apparatus, wherein after the end portion and the abutting member inserted in the paper conveyance path are brought into contact with each other, the paper is punched by the punching means. After the energization of the actuator is stopped and the paper is sandwiched again by the transport roller, the transport roller is reversed to transport the paper in the reverse direction, so that the rear end of the paper and the abutting member are brought into contact with each other. The post-processing apparatus according to claim 1, wherein the post-processing apparatus is contacted. The post-processing apparatus according to claim 1, further comprising an entrance roller that is disposed upstream of the punching unit in a sheet conveyance direction and introduces the sheet into the punching unit. The post-processing apparatus according to claim 1, wherein the actuator is a solenoid. 5. The post-processing apparatus according to claim 1, wherein two pairs of the conveyance roller and the actuator are provided. 6. An image forming system, wherein the post-processing device according to claim 1 is connected to an image forming apparatus having at least an image writing unit, an image forming unit, a sheet conveying unit, and a control unit. In a paper punching method of punching a file by a punch provided in a punching means at a predetermined position of the transported paper,
Sandwiching and transporting the paper by a transport roller disposed downstream in the paper transport direction with respect to the punching means, and passing at least the leading edge of the paper through the punching means;
Releasing the clamping of the sheet by the transport roller by energizing the actuator;
A step of aligning the sheet in the sheet width direction perpendicular to the sheet conveying direction by the aligning unit;
Stopping energization of the actuator and sandwiching the paper again by the transport roller;
Inserting an abutting member disposed upstream of the punch in the paper conveyance direction into the paper conveyance path;
Contacting the rear end of the paper and the abutting member;
Punching the paper with the punching means;
A paper punching method characterized by comprising: 8. The method according to claim 7, further comprising the step of transporting the paper in the reverse direction by reversing the transport roller after the step of stopping energization of the actuator and sandwiching the paper again by the transport roller. The paper punching method according to 1. 9. The abutting member is retracted from the conveyance path of the paper during the step of conveying the paper by the conveyance roller and passing the punching unit. Paper punching method. The paper punching method according to claim 7, wherein the actuator is a solenoid.

Images